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    <title>Document</title>
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    <style>
        .red{
            color: red;
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        .warning {
            font-size: 24px;
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        div{
            width: 50px;
            
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<body>
    <!-- <p>今天有点小热</p>
    <div>我有饮料我不怕</div>
    <p>放假好啊</p> -->

    <p class="kaun">我不是警告</p>
    <p class="warning red">警告警告</p>
    <span class="warning">我也是警告</span>
    <span class="red">我是红色，但我字体不想变大</span>
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